Job johnson



1. loHNfsoN.'

Furniture Casters.

NO'", 136,522, PatentedMarch 4,1873.

AM PHom -L rma GRAPH/c ca N. Y. ossamvs's PROCESS) PATENT OEEIOE.

JOB JOHNSON, OF BROOKLYN, NEW YORK.

IMPROVEMENT ihl FURNITURE-CASTERS.

Specification forming part of Letters Patent No. 136,522, dated March 4,1873.

OAsE A To all whom @t may concern:

Beit known that I, JOB JOHNSON, of Brooklyn, Kings county, State of NewYork, have invented Improvements in 4Balt-Casters, of which thefollowing is a specification:

Before my invention a ball-caster had been made with a metallic ball iua cup, retained by a cap, the bearing for the ball within the cup beinghemispherical, and the cap has been screwed on and retained by abayonet-lock.

My invention is made for connectingthe cap more securely to the socketconta-ming`Y` the ball. The ball is kept in place by a locking-cap,provided with a lug or lugs entering a groove or grooves in the socket,and a screw or pin inserted in the cap prevents the parts turning orworking loose.

In the drawing, Figure l is a vertical section of the caster. Fig. 2 isa sectional plan at the line a0 and Fig. 3 is an elevation of the socketfor the leg and ball.

rlhe leg a of the article of furniture passes into the socket b of thecaster, or the parts are connected in any convenient manner. The ball dis received within a cup of very hard steel, with a ilat bottom, e, andcylindrical sides i, the diameter ofthe cup being slightly greater thanthat ofthe ball, and deeper than half the diameter ofthe ball, so thatthe said ball will be free Within the cup; it will not be obstructed byparticles of gritthey can work out freely-and the ball will only touchupon two point-s as it rolls. A cap, l, is employed to retain the ballin place, and this is secured around the metallic socket by a pin uponthe inside of the cap passing into a groove, 3, in the outside of saidsocket, the groove being inclined, as represented in Fig. There may betwo of these inclined locking-grooves, and a screw or pin, 4, insertedthrough the cap l, or at the edge thereof, prevents the cap turning orbecoming disconnected.

I claim as my invention- The cap vl, secured to the socket containingthe caster-ball by a pin entering the groove 3, and a screw or pin, 4,to prevent the cap turning, as set forth.

Signed by me this 10th day of' December,

JOB JOHNSON.

Witnesses:

GEO. T. PINOKNEY, GHAs. H. SMITH.

